3 26 



STRUCTURE AND LIFE HISTORIES 



FIG. 232. Diagram of a nest of a fungus-growing ant (Trachymyrmex 

 obscurior), showing four chambers. The pendant white masses in three 

 of the chambers are the mycelium of the fungus the so-called "fungus- 

 gardens." The species of the fungus has not been definitely determined, 

 but they are thought to belong to the Ascomycetes. (After W. M. 

 Wheeler.) 



FIG. 233. Epiphytes or "air" plants (Tillandsia sp.), growing on tele- 

 phone wires at Ponce, P. R, 



